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if this book were hotter? what would it do to the table? energy would cascade from the book to the table until they both became the same temperature and they will level off. so that alcohol that's poured on your back has the same temperature as anything else around, but it feels cold. and why does it feel cold, gang? because what is that alcohol doing? what it's doing is what we're gonna be talking about today. it's changing state. it's changing from the liquid state to the gaseous state, okay? and we call that what? begin with ev? evaporation. evaporation, that's right. and we're gonna be learning that evaporation is a cooling process. you know, sometimes you're swimming and you come out and you're all wet, a little breeze come by and you feel kinda chilly. but if no breeze comes by, you don't feel so chilly. and what's going on? when that breeze comes by, what happens to the water on your body? evaporates. it evaporates. when it evaporates, how does your body feel? begin with a c. - cool. - cool. now, we're gonna ask the question hc. why is it that evaporation is a cooling process? and we ca
electrons are bopping around and those electrons-- hit their neighbors-- and that energy cascades all down the middle. so it turns out that things with lose electrons are good heat conductors. later on, we're gonna learn things with good-- with lose electrons are good electrical conductors. and how many say, "oh, that's probably a coincidence"? it's not a coincidence. it's a good electrical conductor for the same reason. those lose electctrons can flow right through a piece of metal, gang. and when that--now, we're talking about electricity. we'll be talking about that soon, yeah? but for now, those metal-- those little electrons will bop, bop, bop, bop, bop, which are lose in metals and carry that energy right along. so some things conduct better than other things. piece of wood, very, very good insulator. this wood is a good insulator at any temperature. this wood is a good insulator even if it's very, very hot. yep. did you ever reach in to a hot oven and grabbed on to a frying fan that's about maybe 400 degrees fahrenheit? you're gonna cook some food or something, you got a frying pan
that's one degree celsius. if something is one degree above freezing, would it be radiating energy? yes. would that energy have a frequency? how about i compare that to radiating at two degrees above celsius? would that be radiating energy? would that energy have a frequency? yes. would that frequency be doubled? no. check your neighbor. yeah. ah. hey, gang. would the temperature be-- would the frequency be doubled? get right to that point. get right to that question. the question is: wouldn't that work best for kelvin? yeah. honey, it will only work for kelvin because one degree celsius is not twice as hot as two is-- i should say two degrees celsius is not twice as hot as one degree celsius. see, to say twice as hot is to imply twice the internal energy. try this one. the waitress brings over some coffee because you've ordered coffee with your apple pie, and you say, "oh, i'd like the coffee really hot." and she brings it over, and you put your trusty thermometer in, and, son of a gun, it's iced coffee. ice cubes and everything. it's zero degrees celsius. and you say to the waitress,
for energy or for building tissue; they are inert, which means we don't use them at all and they just pass through; or they're toxicants-- they have the ability to alter the biochemistry within our body. good shot! parents of toddlers and small children must be particularly careful about protecting young ones from toxic substances-- the cleaning compounds and plants, cosmetics and drug products familiar to most households. michael bryant: and so prevention begins to be the key, and looking for those, what i like to call, "hidden dangers" in your home that kids can get into, and trying to be proactive in terms of educating yourself and them about those dangers. and they exist in some of the most unlikely places. i mean, kids do things that we would never imagine that they would venture into, simply because of their curiosity. other health hazards may be less obvious, as a number of families in this chicago nehborhood lened, when an enterprising pest control service started using a chemical designed for agricultural use to destroy their household pests. milton clark methylonsrgano-phatstide.
by restless energy. he could use his very fluent draftsmanship to give a sense of the most immediate, the most spontaneous recording and projecting of something seen in the modern world. that economy also spreads to the devices he uses, which bring the spectator of his works into the game. "i recognize that. i know that that's very up to date. i understand it. i am modern like the artist." and it's that interplay that he generates between the spectator and his audience that is very, very modern. (narrator) the painter of montmartre's decadence had an aristocratic start. born in 1864, henri raymond de toulouse-lautrec came from a noble and distinguished family-- count raymond of toulouse had helped capture jerusalem in the first crusade. henri's branch of the family came from the red-brick city of albi in the south of france. henri grew up in a world of chateaus and privilege in a family living on the fruits of its noble past. but a france governed by the middle class was losing its taste for nobility. like many aristocrats, his father alphonse retreated into rural pastimes-- riding and hunting
deep within the earth. their hidden presence may have charged the sacred precinct with spiritual energy. the olmec world was alive with unseen spirits that contrled all natural phenomena. thunder cracks ) rresent the power of these mysterious forces, olmec artists combined features of the most fearsome predators of the jungle, creating hybrid images of awe- inspiring supernatural beings. irual leaders, or shans, lied humans to the fors controinthe uner peleelieved that the sha could slo epraesr shans, and magically transform themselves tohepe oa jaguar transported by thianimal spirit, they road e cosmos gaining knowledge that allowed them to ensure rich harvests, heal the sick and protect the community. rulers also claimed the power to mediate between human and spiritual realms. some are shown cradling a supernatural infant-- part human, part jaguar-- who may have been their link to the spiritual world. similar figures appear on sculptures found at la venta thtirling med to be altars. but decades later, a clue to their true function was discovered far from the coast, at thentainous site
Search Results 0 to 5 of about 6